Suddenly shift into neutral when drving?

[oldgun]

DCT tranmission, I believe it's the wet clutch, done 188K KM.

it's driving very well when it's cold, but after 20 minutes, it suddenly shifts into neutral, loose gas then it shift drive mode.

Changed fluid, penrite DCT, flushed 2 times, waiting for the filter.

whats the issues? any fix?

thank you heaps

[AlanM]

It could help if you performed a clutch learn using Forscan while the transmission is fully warmed up.

If you don't have Forscan, it's free to download. Put it on a laptop then all you need is an OBD/USB adapter, good ones can be had for about $50 on ebay.

Did you make sure to follow the correct procedure when changing the transmission oil? If not the front compartment could be low on oil, which would result in loss of hydraulic pressure on the clutch and shift actuators. There's videos on YouTube on how to do it.

[oldgun]

Originally Posted by AlanM

It could help if you performed a clutch learn using Forscan while the transmission is fully warmed up.

If you don't have Forscan, it's free to download. Put it on a laptop then all you need is an OBD/USB adapter, good ones can be had for about $50 on ebay.

Did you make sure to follow the correct procedure when changing the transmission oil? If not the front compartment could be low on oil, which would result in loss of hydraulic pressure on the clutch and shift actuators. There's videos on YouTube on how to do it.

Thank you so much mate

I found it drove not smoothly when I got it, then changed fluid according to the YT or manual. then it drives very smotthy, no shuddder or hesitation. then this happens, when I was waiting for redlight on uphill, it shift into neutral, pressed gas again, it drove normally.

[goz007]

Sounds like it's low on oil.

[oldgun]

Originally Posted by goz007

Sounds like it's low on oil.

I have double checked the level, also just fluashed again.

Added 6.5L fluid into the fill hole under the airbox.

It'a not the low fluid.
I hightly doubt it's solenoid, that's why it's playing up when it's hot, normally after driving around for 2 minutes.

It's butterly smooth when it's cold.

Net step is remove the valvle body and clean those solenoids

[goz007]

Get Forscan & get transmission up to running temp(when it's having the issue)u will be able to manually command/test the solenoids to confirm what u are thinking.

[oldgun]

Removed the TCM and cleaned seninods, changed fluid again.

REmained same prob.

Then I removed cooler and flushed coolant, looks like it never been changed before.also oil cooler is half blocked, removed filter housing and two pipes, cleaned and blowed dry.

Then I can feel the oil flowing inside the pipes.

Took it for 40 minutes spin, no prob whatever.

It shifts gears very quickly.

It's the oil cooler blocked!!!

[AlanM]

Originally Posted by oldgun

Removed the TCM and cleaned seninods, changed fluid again.

REmained same prob.

Then I removed cooler and flushed coolant, looks like it never been changed before.also oil cooler is half blocked, removed filter housing and two pipes, cleaned and blowed dry.

Then I can feel the oil flowing inside the pipes.

Took it for 40 minutes spin, no prob whatever.

It shifts gears very quickly.

It's the oil cooler blocked!!!

Good job fixing it! Did you find what was blocking the cooler?

[oldgun]

some photos

[oldgun]

Also, I have found it's not that hard to replace the internal filter, use a 90 degree adapter to make job so easy.